<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .f1{
            width:996px ;
            overflow: hidden;
        }
        .f2{
            width:996px ;
            overflow: hidden;
        }
        .a{
            width:611px;
            height: 376px;
            background-color: gray;
            float: left;

        }
        .b{
            width:375px;
            height: 376px;
            background-color: yellow;
            float:right;
        }
        .c{
            margin: 10px 10px ;
            width: 366px;
            height: 233px;
            background-color: pink;
            float: left;
        }
        .card1{
            margin:10px 8px 10px 20px ;
            width: 198px;
            height: 233px;
            background-color: #0aa1ed;
            float: right;
        }
        .card2{
            margin:10px 8px 10px 8px ;
            width: 198px;
            height: 233px;
            background-color: #0aa1ed;
            float: right;
        }
        .card3{
            margin:10px 8px 10px 8px ;
            width: 198px;
            height: 233px;
            background-color: #0aa1ed;
            float: right;
        }


    </style>
</head>
<body>
<div class="f1">
    <div class="a"></div>
    <div class="b"></div>
</div>
<div class="f2">
    <div class="c"></div>
    <div class="card1"></div>
    <div class="card2"></div>
    <div class="card3"></div>
</div>
</body>
</html>